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Light brown iris with a distinct limbal ring. A limbal ring is a dark ring around the iris of the eye, where the sclera meets the cornea. [1] It is a dark-colored manifestation of the corneal limbus resulting from optical properties of the region. [2]
Contents. Iris (anatomy) This article is about the part of the eye. For other uses, see Iris (disambiguation). The iris in humans is the colored (typically brown, blue, or green) area, with the pupil (the circular black spot) in its center, and surrounded by the white sclera.
Heterochromia is a variation in coloration most often used to describe color differences of the iris, but can also be applied to color variation of hair [1] or skin. Heterochromia is determined by the production, delivery, and concentration of melanin (a pigment ).
Eye color is a polygenic phenotypic trait determined by two factors: the pigmentation of the eye 's iris [1] [2] and the frequency-dependence of the scattering of light by the turbid medium in the stroma of the iris.
Anatomical terms of muscle. [ edit on Wikidata] The ciliary muscle is an intrinsic muscle of the eye formed as a ring of smooth muscle [3] [4] in the eye's middle layer, uvea ( vascular layer ). It controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humor into Schlemm's canal.
It contains limbal stem cells in its palisades of Vogt. It may be affected by cancer or aniridia (a developmental problem), among other issues. The PS , RV ring is a visible dark ring around the iris of the eye composed of darkened areas of the corneal limbus.
Lisch nodule, also known as iris hamartoma, is a pigmented hamartomatous nodular aggregate of dendritic melanocytes affecting the iris, [1] named after Austrian ophthalmologist Karl Lisch (1907–1999), who first recognized them in 1937.
The pupil is a hole located in the center of the iris of the eye that allows light to strike the retina. [1] It appears black because light rays entering the pupil are either absorbed by the tissues inside the eye directly, or absorbed after diffuse reflections within the eye that mostly miss exiting the narrow pupil. [citation needed] The size ...
Neovascularization of the iris. Specialty. Ophthalmology. Rubeosis iridis is a medical condition of the iris of the eye in which new abnormal blood vessels (formed by neovascularization) are found on the surface of the iris. [1]
Iris is said to travel on the rainbow while carrying messages from the gods to mortals. In some records, Iris is a sister to fellow messenger goddess Arke ("swift", "quick"), who flew out of the company of Olympian gods to join the Titans as their messenger goddess during the Titanomachy, making the two sisters enemy messenger goddesses.